Simplify parse_limited

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -7,7 +7,7 @@ use rustc_hir::Attribute;
 use rustc_hir::attrs::AttributeKind;
 use rustc_session::Session;
 use rustc_session::parse::{feature_err, feature_warn};
-use rustc_span::{DUMMY_SP, Span, Spanned, Symbol, sym};
+use rustc_span::{Span, Spanned, Symbol, sym};
 use thin_vec::ThinVec;
 
 use crate::errors;
@@ -646,14 +646,7 @@ fn maybe_stage_features(sess: &Session, features: &Features, krate: &ast::Crate)
     let mut errored = false;
 
     if let Some(Attribute::Parsed(AttributeKind::Feature(feature_idents, first_span))) =
-        AttributeParser::parse_limited(
-            sess,
-            &krate.attrs,
-            &[sym::feature],
-            DUMMY_SP,
-            krate.id,
-            Some(&features),
-        )
+        AttributeParser::parse_limited(sess, &krate.attrs, &[sym::feature])
     {
         // `feature(...)` used on non-nightly. This is definitely an error.
         let mut err = errors::FeatureOnNonNightly {

compiler/rustc_attr_parsing/src/attributes/diagnostic/on_unknown.rs

@@ -16,7 +16,9 @@ impl OnUnknownParser {
         args: &ArgParser,
         mode: Mode,
     ) {
-        if !cx.features().diagnostic_on_unknown() {
+        if let Some(features) = cx.features
+            && !features.diagnostic_on_unknown()
+        {
             // `UnknownDiagnosticAttribute` is emitted in rustc_resolve/macros.rs
             return;
         }

compiler/rustc_attr_parsing/src/interface.rs

@@ -2,7 +2,7 @@ use std::convert::identity;
 
 use rustc_ast as ast;
 use rustc_ast::token::DocFragmentKind;
-use rustc_ast::{AttrItemKind, AttrStyle, NodeId, Safety};
+use rustc_ast::{AttrItemKind, AttrStyle, CRATE_NODE_ID, NodeId, Safety};
 use rustc_data_structures::sync::{DynSend, DynSync};
 use rustc_errors::{Diag, DiagCtxtHandle, Level, MultiSpan};
 use rustc_feature::{AttributeTemplate, Features};
@@ -62,18 +62,16 @@ impl<'sess> AttributeParser<'sess, Early> {
         sess: &'sess Session,
         attrs: &[ast::Attribute],
         sym: &'static [Symbol],
-        target_span: Span,
-        target_node_id: NodeId,
-        features: Option<&'sess Features>,
     ) -> Option<Attribute> {
         Self::parse_limited_should_emit(
             sess,
             attrs,
             sym,
-            target_span,
-            target_node_id,
-            Target::Crate, // Does not matter, we're not going to emit errors anyways
-            features,
+            // Because we're not emitting warnings/errors, the target should not matter
+            DUMMY_SP,
+            CRATE_NODE_ID,
+            Target::Crate,
+            None,
             ShouldEmit::Nothing,
         )
     }

compiler/rustc_builtin_macros/src/deriving/generic/mod.rs

@@ -493,7 +493,7 @@ impl<'a> TraitDef<'a> {
         match item {
             Annotatable::Item(item) => {
                 let is_packed = matches!(
-                    AttributeParser::parse_limited(cx.sess, &item.attrs, &[sym::repr], item.span, item.id, None),
+                    AttributeParser::parse_limited(cx.sess, &item.attrs, &[sym::repr]),
                     Some(Attribute::Parsed(AttributeKind::Repr { reprs, .. })) if reprs.iter().any(|(x, _)| matches!(x, ReprPacked(..)))
                 );
 

compiler/rustc_builtin_macros/src/proc_macro_harness.rs

@@ -1,7 +1,7 @@
 use std::{mem, slice};
 
 use rustc_ast::visit::{self, Visitor};
-use rustc_ast::{self as ast, HasNodeId, NodeId, attr};
+use rustc_ast::{self as ast, NodeId, attr};
 use rustc_ast_pretty::pprust;
 use rustc_attr_parsing::AttributeParser;
 use rustc_errors::DiagCtxtHandle;
@@ -109,9 +109,6 @@ impl<'a> CollectProcMacros<'a> {
             self.session,
             slice::from_ref(attr),
             &[sym::proc_macro_derive],
-            item.span,
-            item.node_id(),
-            None,
         )
         else {
             return;

compiler/rustc_builtin_macros/src/test.rs

@@ -3,7 +3,7 @@
 
 use std::{assert_matches, iter};
 
-use rustc_ast::{self as ast, GenericParamKind, HasNodeId, attr, join_path_idents};
+use rustc_ast::{self as ast, GenericParamKind, attr, join_path_idents};
 use rustc_ast_pretty::pprust;
 use rustc_attr_parsing::AttributeParser;
 use rustc_errors::{Applicability, Diag, Level};
@@ -480,14 +480,7 @@ fn should_ignore_message(i: &ast::Item) -> Option<Symbol> {
 
 fn should_panic(cx: &ExtCtxt<'_>, i: &ast::Item) -> ShouldPanic {
     if let Some(Attribute::Parsed(AttributeKind::ShouldPanic { reason, .. })) =
-        AttributeParser::parse_limited(
-            cx.sess,
-            &i.attrs,
-            &[sym::should_panic],
-            i.span,
-            i.node_id(),
-            None,
-        )
+        AttributeParser::parse_limited(cx.sess, &i.attrs, &[sym::should_panic])
     {
         ShouldPanic::Yes(reason)
     } else {

compiler/rustc_builtin_macros/src/test_harness.rs

@@ -61,7 +61,7 @@ pub fn inject(
 
     // Do this here so that the test_runner crate attribute gets marked as used
     // even in non-test builds
-    let test_runner = get_test_runner(sess, features, krate);
+    let test_runner = get_test_runner(sess, krate);
 
     if sess.is_test_crate() {
         let panic_strategy = match (panic_strategy, sess.opts.unstable_opts.panic_abort_tests) {
@@ -387,15 +387,8 @@ fn get_test_name(i: &ast::Item) -> Option<Symbol> {
     attr::first_attr_value_str_by_name(&i.attrs, sym::rustc_test_marker)
 }
 
-fn get_test_runner(sess: &Session, features: &Features, krate: &ast::Crate) -> Option<ast::Path> {
-    match AttributeParser::parse_limited(
-        sess,
-        &krate.attrs,
-        &[sym::test_runner],
-        krate.spans.inner_span,
-        krate.id,
-        Some(features),
-    ) {
+fn get_test_runner(sess: &Session, krate: &ast::Crate) -> Option<ast::Path> {
+    match AttributeParser::parse_limited(sess, &krate.attrs, &[sym::test_runner]) {
         Some(rustc_hir::Attribute::Parsed(AttributeKind::TestRunner(path))) => Some(path),
         _ => None,
     }

compiler/rustc_driver_impl/src/lib.rs

@@ -712,8 +712,7 @@ fn print_crate_info(
                 let crate_name = passes::get_crate_name(sess, attrs);
                 let lint_store = crate::unerased_lint_store(sess);
                 let features = rustc_expand::config::features(sess, attrs, crate_name);
-                let registered_tools =
-                    rustc_resolve::registered_tools_ast(sess.dcx(), attrs, sess, &features);
+                let registered_tools = rustc_resolve::registered_tools_ast(sess.dcx(), attrs, sess);
                 let lint_levels = rustc_lint::LintLevelsBuilder::crate_root(
                     sess,
                     &features,

compiler/rustc_expand/src/config.rs

@@ -7,8 +7,8 @@ use rustc_ast::tokenstream::{
     AttrTokenStream, AttrTokenTree, LazyAttrTokenStream, Spacing, TokenTree,
 };
 use rustc_ast::{
-    self as ast, AttrItemKind, AttrKind, AttrStyle, Attribute, DUMMY_NODE_ID, EarlyParsedAttribute,
-    HasAttrs, HasTokens, MetaItem, MetaItemInner, NodeId, NormalAttr,
+    self as ast, AttrItemKind, AttrKind, AttrStyle, Attribute, EarlyParsedAttribute, HasAttrs,
+    HasTokens, MetaItem, MetaItemInner, NodeId, NormalAttr,
 };
 use rustc_attr_parsing::parser::AllowExprMetavar;
 use rustc_attr_parsing::{
@@ -28,7 +28,7 @@ use rustc_hir::{
 use rustc_parse::parser::Recovery;
 use rustc_session::Session;
 use rustc_session::parse::feature_err;
-use rustc_span::{DUMMY_SP, STDLIB_STABLE_CRATES, Span, Symbol, sym};
+use rustc_span::{STDLIB_STABLE_CRATES, Span, Symbol, sym};
 use tracing::instrument;
 
 use crate::errors::{
@@ -51,14 +51,7 @@ pub fn features(sess: &Session, krate_attrs: &[Attribute], crate_name: Symbol) -
     let mut features = Features::default();
 
     if let Some(hir::Attribute::Parsed(AttributeKind::Feature(feature_idents, _))) =
-        AttributeParser::parse_limited(
-            sess,
-            krate_attrs,
-            &[sym::feature],
-            DUMMY_SP,
-            DUMMY_NODE_ID,
-            Some(&features),
-        )
+        AttributeParser::parse_limited(sess, krate_attrs, &[sym::feature])
     {
         for feature_ident in feature_idents {
             // If the enabled feature has been removed, issue an error.

compiler/rustc_lint/src/builtin.rs

@@ -313,9 +313,6 @@ impl EarlyLintPass for UnsafeCode {
                         cx.builder.sess(),
                         &it.attrs,
                         &[sym::allow_internal_unsafe],
-                        it.span,
-                        DUMMY_NODE_ID,
-                        Some(cx.builder.features()),
                     )
                 {
                     self.report_unsafe(cx, span, BuiltinUnsafe::AllowInternalUnsafe);

compiler/rustc_lint/src/nonstandard_style.rs

@@ -145,7 +145,7 @@ impl NonCamelCaseTypes {
 impl EarlyLintPass for NonCamelCaseTypes {
     fn check_item(&mut self, cx: &EarlyContext<'_>, it: &ast::Item) {
         let has_repr_c = matches!(
-            AttributeParser::parse_limited(cx.sess(), &it.attrs, &[sym::repr], it.span, it.id, None),
+            AttributeParser::parse_limited(cx.sess(), &it.attrs, &[sym::repr]),
             Some(Attribute::Parsed(AttributeKind::Repr { reprs, ..})) if reprs.iter().any(|(r, _)| r == &ReprAttr::ReprC)
         );
 

compiler/rustc_passes/src/debugger_visualizer.rs

@@ -1,7 +1,6 @@
 //! Detecting usage of the `#[debugger_visualizer]` attribute.
 
-use rustc_ast::ast::NodeId;
-use rustc_ast::{HasNodeId, ItemKind, ast};
+use rustc_ast::{ItemKind, ast};
 use rustc_attr_parsing::AttributeParser;
 use rustc_expand::base::resolve_path;
 use rustc_hir::Attribute;
@@ -10,26 +9,14 @@ use rustc_middle::middle::debugger_visualizer::DebuggerVisualizerFile;
 use rustc_middle::query::{LocalCrate, Providers};
 use rustc_middle::ty::TyCtxt;
 use rustc_session::Session;
-use rustc_span::{DUMMY_SP, Span, sym};
+use rustc_span::sym;
 
 use crate::errors::DebugVisualizerUnreadable;
 
 impl DebuggerVisualizerCollector<'_> {
-    fn check_for_debugger_visualizer(
-        &mut self,
-        attrs: &[ast::Attribute],
-        span: Span,
-        node_id: NodeId,
-    ) {
+    fn check_for_debugger_visualizer(&mut self, attrs: &[ast::Attribute]) {
         if let Some(Attribute::Parsed(AttributeKind::DebuggerVisualizer(visualizers))) =
-            AttributeParser::parse_limited(
-                &self.sess,
-                attrs,
-                &[sym::debugger_visualizer],
-                span,
-                node_id,
-                None,
-            )
+            AttributeParser::parse_limited(&self.sess, attrs, &[sym::debugger_visualizer])
         {
             for DebugVisualizer { span, visualizer_type, path } in visualizers {
                 let file = match resolve_path(&self.sess, path.as_str(), span) {
@@ -69,12 +56,12 @@ struct DebuggerVisualizerCollector<'a> {
 impl<'ast> rustc_ast::visit::Visitor<'ast> for DebuggerVisualizerCollector<'_> {
     fn visit_item(&mut self, item: &'ast rustc_ast::Item) -> Self::Result {
         if let ItemKind::Mod(..) = item.kind {
-            self.check_for_debugger_visualizer(&item.attrs, item.span, item.node_id());
+            self.check_for_debugger_visualizer(&item.attrs);
         }
         rustc_ast::visit::walk_item(self, item);
     }
     fn visit_crate(&mut self, krate: &'ast ast::Crate) -> Self::Result {
-        self.check_for_debugger_visualizer(&krate.attrs, DUMMY_SP, krate.id);
+        self.check_for_debugger_visualizer(&krate.attrs);
         rustc_ast::visit::walk_crate(self, krate);
     }
 }

compiler/rustc_resolve/src/build_reduced_graph.rs

@@ -1127,14 +1127,7 @@ impl<'a, 'ra, 'tcx> BuildReducedGraphVisitor<'a, 'ra, 'tcx> {
         let mut import_all = None;
         let mut single_imports = ThinVec::new();
         if let Some(Attribute::Parsed(AttributeKind::MacroUse { span, arguments })) =
-            AttributeParser::parse_limited(
-                self.r.tcx.sess,
-                &item.attrs,
-                &[sym::macro_use],
-                item.span,
-                item.id,
-                None,
-            )
+            AttributeParser::parse_limited(self.r.tcx.sess, &item.attrs, &[sym::macro_use])
         {
             if self.parent_scope.module.parent.is_some() {
                 self.r

compiler/rustc_resolve/src/imports.rs

@@ -149,17 +149,15 @@ pub(crate) struct OnUnknownData {
 
 impl OnUnknownData {
     pub(crate) fn from_attrs<'tcx>(tcx: TyCtxt<'tcx>, item: &Item) -> Option<OnUnknownData> {
-        if let Some(Attribute::Parsed(AttributeKind::OnUnknown { directive, .. })) =
-            AttributeParser::parse_limited(
-                tcx.sess,
-                &item.attrs,
-                &[sym::diagnostic, sym::on_unknown],
-                item.span,
-                item.id,
-                Some(tcx.features()),
-            )
+        if tcx.features().diagnostic_on_unknown()
+            && let Some(Attribute::Parsed(AttributeKind::OnUnknown { directive, .. })) =
+                AttributeParser::parse_limited(
+                    tcx.sess,
+                    &item.attrs,
+                    &[sym::diagnostic, sym::on_unknown],
+                )
         {
-            Some(Self { directive: Box::new(*directive?) })
+            Some(Self { directive: directive? })
         } else {
             None
         }
@@ -216,6 +214,8 @@ pub(crate) struct ImportData<'ra> {
     /// A `#[diagnostic::on_unknown]` attribute applied
     /// to the given import. This allows crates to specify
     /// custom error messages for a specific import
+    ///
+    /// This is `None` if the feature flag for `diagnostic::on_unknown` is disabled.
     pub on_unknown_attr: Option<OnUnknownData>,
 }
 
@@ -845,24 +845,24 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
             .collect::<Vec<_>>();
         let default_message =
             format!("unresolved import{} {}", pluralize!(paths.len()), paths.join(", "),);
-        let (message, label, notes) = if self.tcx.features().diagnostic_on_unknown()
-            && let Some(directive) = errors[0].1.on_unknown_attr.as_ref().map(|a| &a.directive)
-        {
-            let args = FormatArgs {
-                this: paths.join(", "),
-                // Unused
-                this_sugared: String::new(),
-                // Unused
-                item_context: "",
-                // Unused
-                generic_args: Vec::new(),
-            };
-            let CustomDiagnostic { message, label, notes, .. } = directive.eval(None, &args);
+        let (message, label, notes) =
+            // Feature gating for `on_unknown_attr` happens initialization of the field
+            if let Some(directive) = errors[0].1.on_unknown_attr.as_ref().map(|a| &a.directive) {
+                let args = FormatArgs {
+                    this: paths.join(", "),
+                    // Unused
+                    this_sugared: String::new(),
+                    // Unused
+                    item_context: "",
+                    // Unused
+                    generic_args: Vec::new(),
+                };
+                let CustomDiagnostic { message, label, notes, .. } = directive.eval(None, &args);
 
-            (message, label, notes)
-        } else {
-            (None, None, Vec::new())
-        };
+                (message, label, notes)
+            } else {
+                (None, None, Vec::new())
+            };
         let has_custom_message = message.is_some();
         let message = message.as_deref().unwrap_or(default_message.as_str());